New ureas and process for preparing same



United States Patent 3,234,219 NEW UREAS AND PROCESS FOR PREPARING SAME Paul Schmidt, 'Ilzcrwil, and Max Wilhelm and Kurt Eichenherger, Basel, Switzerland, assignors to {Iiba ZIc-rporatien, a corporation of Delaware No Drawing. Filed Aug. 4, 1969, Ser. No. 47,373 Claims priority, application Switzerland, Aug. 13, 1959, 76,9l/5; Mar. 25, 1969, 3,373/69; duly 8, 1360, 7,837/60 14 Claims. (Cl. 260-239) The present invention provides new sulfonyhureas of the formula in which R, stands for an amino group disubstituted by lower aliphatic hydrocarbon radicals whose carbon chain may be interrupted by hetero atoms such as oxygen, nitrogen or sulfur, and R for a lower hydrocarbon radical or oxa-hydrocarbon radicaland of their salts with bases, more especially salts with metals of groups 1 or 2 of the Periodic System, above all their alkali metal salts and alkaline earth metal salts.

Lower aliphatic hydrocarbonradicals are, above all, alkyl, alkenyl, alkylene, cycloalkyl, cycloalkenyl, cycloallryl-alkyl, cycloalkenyl-alkyl radicals which may contain further hydrocarbon radicals, such as alkyl groups or if desired fused on benzene radicals. Radicals of this kind interrupted by hetero atoms are, for example, oxaalkyl or oxa-alkylene radicals. Advantageously, these radicals contain 1 to carbon atoms. As examples, may be mentioned: methyl, ethyl, propyl, isopropyl, straightchain or branched radicals linked in any desired position, such as butyl, pentyl, hexyl or heptylradicals, allyl, methallyl, cyclopentyl, cyclohexyl, cyclopentenyl, cyclohexenyl, cyclopentyl-methyl, oxa-cyclopentylrnethyl, such as 2-oxa cyclopentyl-(l)-methyl, cyclohexylmethyl, methyl-cyclohexyl, cyclohexylethyl, cyclohexenyl -ethyl, .butyiene- (1:4), pentylene-(lzS), hexylene-(l26),.hexylene-(2z5), heptylene-(2:6), 3-oxa-pen-tylene-(1:5), 3-oxa-butyl, 3- oxa-pentyl, 1:2 benzopentylene-(1:5), 2:3-benzopentylcue-(1:5), and similar radicals.

The lower hydrocarbon radical or oXa-hydrocarbon radical R likewise contains advantageously l to 10 carbon atoms and is, above all, an alkyl, oxa-alkyl, alkenyl, alkinyl, cycloalkyl, cycloalkenyl, cycloalkyl-alkyl, cycloalkenyl-allryl, phenyl-alkyl radical, and these radicals may contain further hydrocarbon radicals such, for example, as alkyl groups. As examples may be mentioned: methyl, ethyl, propyl, isopropyl, straight-chain or branched radicals linked together in any desired position, such as butyl, pentyl, hexyl or heptyl radicals, allyl, met-hallyl, cyclopentyl, cyclohexyl, cyclopentenyl, cyclohexenyl, cyclopentylmethyl, oxa-cyclopentylrnemyl, such as cyclohexylmethyl, methyl-cyclohexyl, cyclohexylmethyl, cyclohexenyl-ethyl, 3-oxa-butyl, 3-oxa-pentyl, benzyl or phenylethyl radicals in which the phenyl group may contain, for example halogen atoms, such as fluorine, chlorine, bromine, trifiuoromethyl, or lower alkyl, alkoxy or alkylmercapto groups in which the alkyl groups contain, for exmple l to 3 carbon atoms.

The new compounds possess valuable pharmacological properties. Inter alia, they reduce the blood sugar level and are, therefore, intended to be used as antidiabetic medicaments.

Particularly valuable in this respect are the compounds of the formula and their salts,in which formula R and R stands for lower alkyl radicals containing 1 to 4 carbon atoms each, or R and R together represent a straight-chain or branched alkylene or oxa-alkylene radical containing 4 to 8 carbon atoms, such as butylene-(lz4), pentylene- (1:5), hexylene-(lzo), hexylene-(ZzS), heptylene-(226) or 3-oxa-pentylene-(lz5), and R stands for an alkyl radical containing 1 to 8 carbon atoms, a phenylethyl radical or a cycloalkyl radical.

A special object of the present invention are the compounds, having an especially good blood sugar lowering action, of the formula and their salts, in which formula R stands for a pyrrolidino, piperidino or morpholino radical and R for a cyclopentyl, cyclohexyl or phenylethyl radical, above all the N-(piperidino-sulfonyl)-N'-cyclohexyl urea of the formula and its salts, and also N-(m.orpholino-sulfonyl)-N-(,8- phenyl-ethyl)-urea and its salts.

The new compounds are made by processes as such known. Preferably, a compound each of the formulae R and R have the meaning given above.

The afore-mentioned process is carried out in the conventional manner, in the presence or absence of a diluent and/ or condensing agent, at a low, ordinary or elevated temperature, if desired under superatmospheric pressure.

According to a preferred variant of the process the sulfonamide of the formula R SO NH dissolved in an organic solvent such as acetone, advantageously in the presence of an alkali hydroxide or carbonate is reacted with an isocyanate of the formula OCNR The starting materials areknown or can be made by as such known methods. Preferred starting materials are those which yield the final products designated above as particularly valuable.

Depending on the reaction conditions employed, the new compounds are obtained in the free form or as salts. Salts thus obtained can be converted into the free compounds in the usual manner, for example by acidification. The free compounds can be converted into salts thereof, such as salts with bases, for example ammonia or organic bases, and more especially into the aforementioned metal salts, for example those of sodium, potassium, calcium or magnesium.

The new compounds and salts thereof can be used for example in the form of pharmaceutical preparations, which contain them in admixture with a pharmaceutical organic or inorganic carrier suitable for enteral or parenteral administration. As carriers such substances may be employed as do not react with the new compounds, such as water, gelatinc, lactose, starches, magnesium stearate, talc, vegetable oils, benzyl alcohols, gums, polyalkylene glycols, white petroleum jelly, cholesterol or any other known carrier for medicaments. The pharmaceutical preparations may be in the form, for example, of tablets, dragees, powder or suppositories or in liquid form as solutions, suspensions or emulsions,

The following examples illustrate the invention.

Example 1 A mixture of 6 grams of piperidino sulfonamide, 5 grams of potassium carbonate and cc. of acetone is boiled for 1 hour. 6 grams of n-butyl isocyanate are then added, and the whole is heated for 4 hours at 60.

The reaction mixture is then evaporated, the residue is treated with 2 N-sodium hydroxide solution, and the undissolved matter is filtered olf. Acidification of the filtrate causes the N-(piperidino-sulfonyl)-N'-n-b-utylurea of the formula to separate out in crystalline form. Upon recrystallization from methylene chloride-t-petroleum ether it melts at Ill-112 C.

Example 2 A solution of 10 grams of piperidino sulfonamide in 100 cc. of acetone is stirred with 9 grams of potassium carbonate for 1 hour at the boil. 9 grams of ethyl isocyanate are then added, and the mixture is heated for 2 hours at 50. The reaction mixture is evaporated to dryness in vacuo, and the residue is treated with 100 cc. of 2 N-sodium hydroxide solution. The precipitate is filtered off, and the filtrate is treated with 2 N-hydrochloric acid to reach a pH of 1 to 2. The crystalline precipitate thus formed is the N-(piperidino-sulfonyl)-N'- ethyl-urea of the formula /NSO2NHC0NHCH CH which, after recrystallization from water, melts at 134-136 C.

Example 3 A solution of 6 grams of piperidino sulfonamide in 75 cc. of acetone is stirred for 1 hour at the boil with grams of finely powdered potassium carbonate. grams of cyclohexyl isocyanate are then added, and the whole is heated for 4 hours at 60 C. The reaction mixture is evaporated to dryness, the residue is treated with 100 cc. of 2 N-sodium hydroxide solution, and the precipitate formed is filtered off. On acidifying the filtrate with 2 N-hydrochloric acid, N-(piperidino-sulfonyl)- N'-cyclohexylurea of the formula is obtained in crystalline form. After having been recrystallized from petroleum ether it melts at l41143 C.

Example 4 A solution of 8 grams of piperidino sulfonamide in 75 cc. of acetone is stirred for 1 hour at the boil with 5 grams of finely powdered potassium carbonate. 10 grams of fi-phenylethyl isocyanate are then added, and the mixture is heated for 4 hours at 60 C. The reaction mixture is evaporated to dryness, the residue is treated with 100 cc. of 2 N-sodium hydroxide solution, and the precipitate formed is filtered off. When the filtrate is acidified with 2 N-hydrochloric acid, the N-(piperidino-sulfonyl)- N'-(,8phenylethyl)-urea of the formula separates out as a viscid oil which crystallizes after standing for some time. After recrystallization from ethanol, it melts at 136138 C.

Example 5 A solution of 8 grams of piperidino sulfonamide in 75 cc. of acetone is boiled for 1 hour with 5 grams of potassium carbonate. 10 grams of 2:4-dimethyl-pentyl-(3)- isocyanate are added and the whole is heated for 4 hours at 60 C. The reaction mixture is then evaporated to dryness, the residue is treated witth 100 cc. of 2 N-sodium hydroxide solution, and the precipitate formed is filtered off. When the filtrate is acidified with 2 N-hydrochloric 4 acid, the N-(piperidino-sulfonyl) N [2:4 dimethylpentyl-(3)]-urea of the formula CH(CH3)2 separates out in crystalline form. After recrystallization from alcohol it melts at 156157 C.

Example 6 5 g. of n-butyl isocyanate in 25 cc. of acetone are added dropwise to a solution of 9 g. of morpholinosulfamide in 50 cc. of acetone and 25 cc. of 2 N-sodium hydroxide solution, and the whole is stirred for 3 hours at room temperature. The reaction mixture is heated at 50 C. for 1 hour, and the excess acetone then evaporated. The residue is acidified with 100 cc. of 2 N-hydrochloric acid after which an oil separates and which solidifies after standing for some time. On recrystallization from a mixture of chloroform and petroleum ether there is obtained the N-(morpholino-sulfonyl)-N'-N- butyl-urea of the formula in the form of crystals melting at 1l6-118 C.

Example 7 A solution of 9 g. of morpholino sulfamide in cc. of acetone is stirred for 1 hour at the boil with 5 g. of finely powdered potassium carbonate. 9 g. of cyclohexyl isocyanate are then added, and the whole is heated for 4 hours at 60 C. The reaction mixture is evaporated to dryness under reduced pressure, and the residue is mixed with cc. of 2 N-sodium hydroxide solution. Insoluble constituents are filtered off and the filtrate acidified with 2 N-hydrochloric acid. The N-(morpholino-sulfonyl)-N-cyclohexyl-urea of the formula separates out and after recrystallization from ethanol it melts at 151 C.

Example 8 A solution of 9 g. of morpholino sulfamide in 75 cc. of acetone is boiled and stirred for 1 hour with 5 g. of finely powdered potassium carbonate. 10 g. of fi-phenylethyl isocyanate in 25 cc. of acetone are then added, and the whole heated at 60 C. for 4 hours. The reaction mixture is evaporated to dryness, the residue mixed with 100 cc. of 2 N-sodium hydroxide solution and filtered. On acidification of the filtrate, the n-(morpholino-sulfonyl)-N'-(,6-phenylethyl)-urea of the formula separates out in the form of crystals. After recrystallization from ethanol the compound melts at 142 C.

Example 9 8 g. of ethyl isocyanate in 25 cc. of acetone are added to a solution of 12 g. of pyrro-lidino sulfamide in 100 cc. of acetone and 50 cc. of 2 N-sodium hydroxide solution. The mixture is stirred for 3 hours at room temperature and 1 hour at 50 C. and then evaporated under reduced pressure. The residue is dissolved in 100 cc. of 2 N-sodium hydroxide solution, filtered to eliminate insoluble constituents, and the filtrate given a pH of 1-2 with 2 N-hydrochloric acid. The precipitate which forms is recrystallized from a mixture of methylene chloride and petroleum ether. There is obtained the N-(pyrrolidino-sulfonyl)-N-ethyl-urea of the formula in the form of crystals of melting point 139-140 C.

N-S o Faun which after being recrystallized from ethanol melts at 94-95" C.

Example l 12 g. of cyclohexyl isocyanate in 25 cc. of acetone are added to a solution of 12 g. of pyrrolidino sulfarnide in 100 cc. of acetone and 50 cc. of 2 N-sodiurn hydroxide solution. The mixture is stirred at room temperature for 3 hours and at 50 C. for 1 hour. The acetone is evaporated and the residue treated with 50 cc. of 2 N-sodiurn hydroxide solution, the whole is filtered, and the filtrate given a pH of 1-2 with 2 N-hydrochloric acid. A precipitate forms which is recrystallized from a mixture of chloroform and petroleum ether. There is obtained the N-(pyrrolidino-sulfonyl)-N-cyclohexyl-urea of the forin the form of crystals melting at 188-489 C.

Example 11 If) g. of N,N-di-n-propyl sulfamide are boiled for 1 hour in 100 cc. of acetone with 5 g. of finely powdered potassium carbonate. There are then added g. of ,S-phenylethyl isocyanate, and the mixture is heated at C. for 6 hours. The reaction mixture is evaporated and the residue mixed with 100 cc. of 2 N-sodium hydroxide solution, and undissolved matter filtered off. On acidification or" the filtrate with concentrated hydrochloric acid the N- (di-n-propylamino-sulfonyl)-n-(B-phenylethyl)urea of the formula CHaCHzCHs CHaCHzCI-lz separates out in the form of crystals. After being recrystallized from the mixture of chloroform and petroleum ether, the compound melts at 101103 C.

The di-n-propyl sulfamide used as starting material can be prepared in this manner:

g. of sulfamide and cc. of di-n-propylamine are stirred at C. for 10 hours. After cooling, 50-0 cc. of 2 N-hydrochloric acid are added, and the precipitate is filtered off. On recrystallization from a mixture of chloroform and petroleum ether there is obtained the di-n-propyl sulfamide of the formula CI'IJCIIEC E12 NSO2NH2 CI'IQCII'ZClifl in the form of crystals melting at 68 C.

Example 12 A solution or" 15 g. of N,N-di-propyl sulfamide in 75 cc. of acetone is stirred with 5 g. of finely powdered potassium carbonate for 1 hour at the boil. There are then added 10 g. of cyclohexyl isocy-anate and the whole is refluxed for 3 hours. The reaction mixture is eva orated to dryness, treated with 75 cc. of 2 N-sodium hydroxide solution and filtered while Warm. On acidification of the filtrate with concentrated hydrochloric acid a precipitate is formed which is recrystallized from ethanol. There is obtained in this manner the N-(dhnpropylamino-sulfonyl)-N'-cyclohexyl-urea of the formula in the form of White crystals of melting point 123- 125 C.

Example 13 A solution of 10 g. of hexamethylene-irnino-sulfamide in cc. of acetone is stirred with 5 g. of finely powdered potassium carbonate at the boil for 1 hour. There are then added 9 g. of cyclohexyl isocyanate, and the mixture is heated at 50 C. for 2 hours. The reaction mixture is evaporated to dryness under reduced pressure, and the residue is treated with 100 cc. of 2 N-sodium hydr xide solution. Undissolved matter is filtered off and the filtrate treated with 2 N-hydrochloric acid to achieve a pH of 1-2. N-(hexarnethylene-imino-sulfonyl)- N'-cyclohexyl-urea of the formula precipitates. After recrystallization from ethanol it melts at 1674.68 C.

The hexarnethylene-imino-sulfamide used as starting material is prepared as follows:

25 g. of hexarnethylene-imine and 20 g. of sulfamide are stirred at 100 C. for 4 hours. There are then added 300 cc. of 2 N-hydrochloric acid, and the resulting precipitate is filtered off to obtain hexamethylene-iminosulfamide of the formula which after being recrystallized from a mixture of chloroform and petroleum ether melts at 66-68 C.

Example 14 To a solution of 11 g. of 1,2,3,4-tetrahydroisoquinolino-sulfamide in 25 cc. of 2 N-soduim hydroxide solution and 50 cc. of acetone are added 5 g. of n-butyl isocyanate in 50 cc. of acetone, and the whole is stirred at room temperature for 3 hours and at 50 C. for 1 hour. The acetone is then evaporated under a waterjet vacuum. The residue is treated with 50 cc. of 2 N- sodiurn hydroxide solution, filtered, and the filtrate acidified with Z-N-hydrochloric acid. A precipitate of N-(1,2,3,4-tetrahydro isoquinolino sulfonyl) N nbutylurea of the formula forms which after being recrystallized from a mixture of chloroform and petroleum ether melts at 1l5117 C.

The 1,2,3,4-tetrahydro-isoquinolino-sulfarnide used as starting material is prepared as follows:

30 g. of 1,2,3,4-tetrahydro-isoquinoline and 30 g. of sulfamide are heated at 120 C. for 4 hours. After cooling, 300 cc. of 2 N-hydrochloric acid are added, and the resulting precipitate is recrystallized from ethanol. There is obtained the 1,2,3,4-tetrahydroisoquinolinosulfarnide of the formula in the 'form of crystals melting at 157 C.

Example 15 A solution of 10 grams of morpholino sulfaniide in 100 cc. of acetone is boiled for 1 hour with stirring with 5 grams of finely powdered potassium carbonate. 7 grams of isobutylisocyanate in 25 cc. of acetone are then added and the whole stirred for 3 hours at 50 C. The reaction mixture is evaporated to dryness, treated with 100 cc. of 2 N-sodium hydroxide solution, whereupon the precipitate is filtered off. On acidifying the filtrate, N-(morpholinosulfonyl)-N-isobutylurea of the formula separates in the form of white crystals. After recrystallization from a mixture of ethanol and water the compound melts at 170-171 C.

Example 16 10 grams of morpholino sulfamide are boiled for 1 hour with 5 grams of potassium carbonate in 75 cc. of acetone. grams of benzyl-isocyanate are then added and the whole heated for 6 hours at 60 C. The residue remaining on evaporating the reaction mixture is treated with 2 N sodium hydroxide solution and the undissolved constituents are filtered off. On acidifying the filtrate with hydrochloric acid, N-(morpholino-sulfonyl)-N-benzylurea of the formula separates in the form of crystals. After recrystallization from alcohol the compound melts at 184185 C.

What is claimed is:

. N-(piperidino-sulfonyl)-N-cyclohexyl-urea. N- piperidino-sulfonyl -N-ethyl-urea.

N- piperidino-sulfonyl -N' fi-phenyl-ethyl) -urea. N- morpholino-sulfonyl -N-n-butyl-urea. N-(morpholinosulfonyl)-N'-cyclo-hexy1-urea. N- (morpholino-sulfonyl) -1-I'-({3-phenyl-ethyl) -urea. N-( l-pyrrolidino-sulfonyl)-N-ethyl-urea.

N-( l-pyrrolidino-sulfonyl -N'-cycl0hexyl-urea. N-(di-n-propylamino-sulfonyl)-N'-cyclohexy1urea. 10. N-(hexamethyleneimino-sulfonyl) N'-cyclohexyl urea.

11. N-(1:2:3:4-tetrahydro-isoquinolino sulfony1)-N- n-butyl-urea.

12. N-(morpholino-sulfonyl)-N-isobutylurea. 13. A member selected from the group consisting of sulfonyl ureas of the formula wherein R and R each stands for lower alkyl, and R stands for a member selected from the group consisting of cyclo-lower alkyl and phenyl-lower alkyl, and their salts with metals selected from the group consisting of those of Group I and Group II of the Periodic System.

14. Sulfonyl ureas of the formula References Cited by the Examiner UNITED STATES PATENTS 2,079,541 5/1937 Eattegay 260556 2,390,253 12/1945 Henke 260-5 53 2,527,861 10/1950 Walter 260556 2,968,158 1/1961 Ruschig et al 260553 3,108,098 10/1963 McManus 260-553 X FOREIGN PATENTS 993,465 7/1951 France.

859,156 12/1952 Germany. 890,883 9/1953 Germany.

OTHER REFERENCES Appel et al.: Chemische Berichte, vol. 91, pp. 1195- 1200 (1958).

Bergmann: The Chemistry of Acetylene and Related Compounds, p. (1948).

German Auslegeschrift 1,064,284, Aug. 27, 1959.

Hokefelt et al.: J. Med. & Pharm. Chem., vol. No. 2, pages 231239 (1962).

Paquin: Kunststofle, vol. 37, pages -167 and 169 Petersen, Ber. Deut. Chem., vol. 83, pages 551-558 (1950).

Ruschig et al.: Arzn. Forsch. vol. 8, No. 7a, pp. 448- 454 (1958).

Wood et al.: J. Soc. Chem. Ind., vol. 5a, pages 346- 3491.

WALTER A. MODANCE, Primary Examiner.

IRVING MARCUS, JOHN D. RANDOLPH, Examiners. 

10. N-(HEXAMETHYLENEIMINO-SULFONYL) - N''-CYCLOHEXYLUREA.
 14. SULFONYL UREAS OF THE FORMULA 